Two former Parramatta Eels players are accused of harbouring semi-automatic weapons and possessing more than half-a-million dollars in cash after dramatic arrests in Sydney's Centennial Park yesterday.

Scipione 'happy' to front Lindt inquest

NSW Police Commissioner Andrew Scipione has offered to give evidence at the inquest into the Sydney siege to answer questions about the police response to the deadly 17-hour stand-off at the Lindt cafe.

The confirmation on Wednesday from Mr Scipione that he will appear in the witness box if called by the coroner comes after the families of the hostages killed during the December 2014 siege called for him and Deputy Commissioner Catherine Burn to front the inquest.

"We have assisted the inquest from the very start," Mr Scipione told reporters on Wednesday.

"My strong position is that we will do absolutely everything we can to assist them."

He said while the calling of witnesses was a matter for the coroner, "on this occasion, should I be called, I would be more than happy to attend".

"I don't set proceedings and witnesses, that's not a matter for me," Mr Scipione said.

Ms Burn, whose responsibilities include counter-terrorism, has also not yet been called to give evidence at the inquest.

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But Ms Burn is expected to provide a written statement, after the families of Tori Johnson and Katrina Dawson - the two hostages killed during the siege - last week requested she do so to account for her actions at the time.

It has been reported that Mr Scipione and Ms Burn both left the police command post before the Lindt cafe siege ended.

"We will get a full statement from Ms Burn concerning her involvement," counsel assisting the coroner Jeremy Gormly SC told the inquest last week.

"We've had letters from the families (asking) Burn, (acting deputy commissioner Jeff) Loy and Scipione to be called."